FreeBSD : FreeBSD -- kernel memory disclosure from /dev/midistat (5027b62e-f680-11e9-a87f-a4badb2f4699)

high Nessus Plugin ID 130245


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The remote FreeBSD host is missing one or more security-related updates.


The kernel driver for /dev/midistat implements a handler for read(2).
This handler is not thread-safe, and a multi-threaded program can exploit races in the handler to cause it to copy out kernel memory outside the boundaries of midistat's data buffer. Impact : The races allow a program to read kernel memory within a 4GB window centered at midistat's data buffer. The buffer is allocated each time the device is opened, so an attacker is not limited to a static 4GB region of memory.

On 32-bit platforms, an attempt to trigger the race may cause a page fault in kernel mode, leading to a panic.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 130245

File Name: freebsd_pkg_5027b62ef68011e9a87fa4badb2f4699.nasl

Version: 1.2

Type: local

Published: 10/25/2019

Updated: 12/18/2019

Dependencies: ssh_get_info.nasl

Configuration: Enable paranoid mode

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: E:U/RL:OF/RC:C


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:FreeBSD, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 10/24/2019

Vulnerability Publication Date: 8/20/2019

Reference Information

CVE: CVE-2019-5612

FreeBSD: SA-19:23.midi